3ds max 5........ need help with spline modelling a car

What am i suppose to do after i made the splines in the top and side views. the splines are just flat on said views, it has no folume.I've done the rhino tut in max but i still can't figure it out. all the tutorials on the wb just shows you what it's suppose to look like.

can someone please talk me through the very first steps i.e where tobegin and how to move those splines ect,ect. Please guys.